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针对Ad Hoc网络中自私节点造成的攻击问题,提出了一种基于信任评估的Ad Hoc安全路由协议TEAR。该协议在节点行为信任评估方案的基础上,通过使用链路信任值和路径信任值表示节点和路径的可信度,同时,在链路信任值计算时,引入了基于公共邻居节点的间接信任评估方法和可变时间窗机制,保证了信任值计算的准确性和实效性;协议中每个节点维护一张信任表,并重新定义了路由请求和路由回复消息格式,实现了安全路径的快速选择。使用NS2进行模拟验证,又与AODV以及基于固定时间窗信任评估的安全路由协议TA-AODV进行性能对比。结果表明,改进的信任评估方案具有更好的性能,采用该方案的安全路由协议能较快地发现自私节点,并准确选择安全路径,提高了Ad Hoc网络性能。
In order to solve the attack problem caused by selfish nodes in Ad Hoc networks, an Ad Hoc secure routing protocol (TEAR) based on trust evaluation is proposed. Based on the node trust evaluation scheme, the protocol uses the link trust value and the path trust value to represent the credibility of nodes and paths. At the same time, the indirect trust based on the public neighbor nodes is introduced in the calculation of the link trust value Evaluation method and variable time window mechanism to ensure the accuracy and effectiveness of the calculation of trust value. Each node in the protocol maintains a trust table and redefines the routing request and routing reply message format to achieve fast security path select. Using NS2 for simulation verification, it also compares with AODV and TA-AODV, a secure routing protocol based on fixed-time window trust assessment. The results show that the improved trust evaluation scheme has better performance. The secure routing protocol adopting this scheme can find selfish nodes more quickly and select the secure path accurately, which improves the performance of Ad Hoc networks.